Use previous appveyor image.

https://github.com/dotnet/standard/issues/567
8 years ago · 29a2b1d74f
1 changed files with 1 additions and 1 deletions
--- a/appveyor.yml
+++ b/appveyor.yml
@ -1,4 +1,4 @@
-os: Visual Studio 2017
+os: Previous Visual Studio 2017
 platform:
 - Any CPU
 skip_branch_with_pr: true